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Retirement Plans - Schedule of Net Periodic Benefit Cost Not yet Recognized (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
United Kingdom Subsidiary | UK Plan
Defined Benefit Plan Disclosure [Line Items]
Unrecognized losses	$ 102,943	$ 88,818

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- Definition

After tax net amount of gain (loss) that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases (decreases) in other comprehensive income as they arise.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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